Korst later re-appeared, disguised as Nathan Goss, a child prodigy involved in the Pharos Institute's experiments with the telekinesis amplification device, MITRE. He allied himself with Dax Fex Fize and Bloorm Vungah Bart Slitheen as well as Mr Smith, who secretly worked towards world domination by the Xylok. He sought revenge on Sarah Jane Smith for the death of his family, and was involved in the kidnapping of Luke Smith. Mr Smith double-crossed the Slitheen and planned to destroy the Earth, by using Luke's telekinetic power to bring the Moon crashing into Earth. The Xylok was stopped and the three Slitheen left Earth in peace. (TV: The Lost Boy)